This 20-week half-marathon beginner training plan prepares for a HM peak performance with 4 running days/week. Training starts at 13 miles/week and peaks at 25 miles/week. For each run, I provide the exact pace, heart rate, and power range. Simply set up your training zones based on your fitness level with a click of a mouse button. • Upload all workouts to your running watch • Switch plan level, free within 14 days • Free email coach support